Hi,
What it's doing sounds related to the idle air control valve (IAC). The IAC is responsible for the idle speed and adjusts when a load is placed on it. For example, the A/C would require the engine to increase the idle.
What I suggest is to remove the IAC on the throttle body. Inspect it and inside the Throttle Body where it mounts for dirt, corrosion, carbon, or anything that can restrict the air passage. Here is a link that explains how to service one:
https://www.2carpros.com/articles/idle-air-control-valve-service
If the pintle on the IAC is in bad condition, replace it. Also, it is important that the air passage through the Throttle Body is clean as well.
If it needs to be replaced, I attached the directions below.
Let me know what you find or if you have other questions.
Take care,
Joe
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Tuesday, April 26th, 2022 AT 8:25 PM